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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front. Environ. Sci. Eng.    2021, Vol. 15 Issue (4) : 61    https://doi.org/10.1007/s11783-020-1353-7
RESEARCH ARTICLE
Stabilization of hexavalent chromium with pretreatment and high temperature sintering in highly contaminated soil
Haiyan Mou1, Wenchao Liu1,2, Lili Zhao1,3, Wenqing Chen1(), Tianqi Ao4
1. College of Architecture and Environment, Sichuan University, Chengdu 610065, China
2. Wuhan Economic & Technological Development Zone (Hannan) Urban Administration Bureau, Wuhan 430056, China
3. Geological Brigade of Sichuan Bureau of Geology & Mineral Resources Geological, Chengdu 611830, China
4. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
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Abstract

• Separate reduction and sintering cannot be effective for Cr stabilization.

• Combined treatment of reduction and sintering is effective for Cr stabilization.

• Almost all the Cr in the reduced soil is residual form after sintering at 1000°C.

This study explored the effectiveness and mechanisms of high temperature sintering following pre-reduction with ferric sulfate (FeSO4), sodium sulfide (Na2S), or citric acid (C6H8O7) in stabilizing hexavalent chromium (Cr(VI)) in highly contaminated soil. The soil samples had an initial total Cr leaching of 1768.83 mg/L, and Cr(VI) leaching of 1745.13 mg/L. When FeSO4 or C6H8O7 reduction was followed by sintering at 1000°C, the Cr leaching was reduced enough to meet the Safety Landfill Standards regarding general industrial solid waste. This combined treatment greatly improved the stabilization efficiency of chromium because the reduction of Cr(VI) into Cr(III) decreased the mobility of chromium and made it more easily encapsulated in minerals during sintering. SEM, XRD, TG-DSC, and speciation analysis indicated that when the sintering temperature reached 1000°C, almost all the chromium in soils that had the pre-reduction treatment was transformed into the residual form. At 1000°C, the soil melted and promoted the mineralization of Cr and the formation of new Cr-containing compounds, which significantly decreased subsequent leaching of chromium from the soil. However, without reduction treatment, chromium continued to leach from the soil even after being sintered at 1000°C, possibly because the soil did not fully fuse and because Cr(VI) does not bind with soil as easily as Cr(III).

Keywords Chromium      Heavy contaminated soil      Reduction      Sintering      Stabilization      Speciation     
Corresponding Author(s): Wenqing Chen   
Issue Date: 22 October 2020
 Cite this article:   
Haiyan Mou,Wenchao Liu,Lili Zhao, et al. Stabilization of hexavalent chromium with pretreatment and high temperature sintering in highly contaminated soil[J]. Front. Environ. Sci. Eng., 2021, 15(4): 61.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-020-1353-7
https://academic.hep.com.cn/fese/EN/Y2021/V15/I4/61
Fig.1  Characterization of Cr-contaminated soil (a. X-ray diffraction pattern, b. SEM image).
Elements Contents (wt.%)
SiO2 66.17±0.41
Al2O3 13.76±0.19
Fe2O3 5.23±0.11
K2O 3.47±0.09
MgO 2.49±0.08
Na2O 2.28±0.08
CaO 1.50±0.06
Ti2O 1.18±0.05
Tab.1  The main chemical composition of Cr-contaminated soil
Fig.2  The effect of adding amount of FeSO4, Na2S, C6H8O7 on the concentrations of Cr(VI) and total Cr leaching (a, b, c), and chromium speciation in soil (d, e, f).
Fig.3  The effects of adding amount of FeSO4 (a), Na2S (b), C6H8O7 (c) on soil pH.
Fig.4  The effects of sintering temperature on chromium leaching concentration (a, b, c, d) and Cr speciation (e, f, g, h) of original soil, FeSO4-Rsoil, Na2S-Rsoil, C6H8O7-Rsoil.
Fig.5  X-ray diffraction pattern of FeSO4-Rsoil (a), Na2S-Rsoil (b), C6H8O7-Rsoil (c) after sintering at 1000°C.
Fig.6  TG and DSC curves of the Cr-contaminated soil.
Fig.7  The SEM image of original soil (a), FeSO4-Rsoil (b), Na2S-Rsoil (c), C6H8O7-Rsoil (d) after sintering at 1000°C.
Fig.8  The SEM image of FeSO4-Rsoil (a. ×100 times, 600°C; b. ×2000 times, 600°C; c. ×100 times, 800°C; d. ×2000 times, 800°C; e. ×100 times, 1000°C; f. ×2000 times, 1000°C).
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